1、15用英语：fifteen，英 [ˌfɪfˈtiːn] 美 [ˌfɪfˈtiːn]。

2、The talks began some fifteen minutes late.商谈迟了约十五分钟才开始。

3、We paid off our mortgage after fifteen years.我们历经十五年的时间还清了抵押借款。

4、Bob spent fifteen months alone on his yacht. Ann, meanwhile, took care of the children on her own.鲍勃独自在他的游艇上待了十五个月。在这段时间，安一个人照顾孩子。